Three-hour postprandial blood glucose 16.8mmol/L should be timely to the hospital, under the guidance of the endocrinologist treatment. Three-hour postprandial blood glucose 16.8mmol/L is obviously more than the normal value, it is recommended to measure the patient’s fasting blood glucose, 2-hour postprandial blood glucose, glycated hemoglobin, and according to the patient’s symptoms of whether there is dry mouth, drinking, urination, weight loss, to assess whether diabetes has occurred. Patients with a clear diagnosis of diabetes mellitus should have dietary control, reduce carbohydrate intake, and engage in appropriate physical activity. Patients with markedly elevated blood glucose levels should be given medication, such as oral metformin tablets, glimepiride, and, if necessary, subcutaneous insulin therapy under the guidance of a professional endocrinologist. Some patients may have transient elevation of blood glucose due to other reasons, such as stress, infection, etc. At this time, we need to actively remove the triggers, and review the blood glucose on the next day, if the blood glucose is back to normal, we can not use hypoglycemic drug treatment.